US 12,235,666 B2
Fast soft-start reference current controlled by supply ramp
Venkateswarlu Ramaswamy Tiruvamattur, Karnataka (IN); and RamaKrishna Ankamreddi, Bengaluru (IN)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by Texas Instruments Incorporated, Dallas, TX (US)
Filed on Jun. 9, 2022, as Appl. No. 17/806,240.
Claims priority of application No. 202141025761 (IN), filed on Jun. 10, 2021.
Prior Publication US 2022/0397925 A1, Dec. 15, 2022
Int. Cl. G05F 1/567 (2006.01); G05F 1/46 (2006.01); G05F 3/26 (2006.01); H03F 3/45 (2006.01)
CPC G05F 1/567 (2013.01) [G05F 1/468 (2013.01); G05F 3/262 (2013.01); H03F 3/45183 (2013.01)] 25 Claims
OG exemplary drawing
 
1. A low-dropout (LDO) voltage regulator circuit, comprising:
an amplifier having a first input, a second input, and an output, the first input of the amplifier coupled to a power supply terminal via a first resistor, the second input of the amplifier coupled to the power supply terminal via a second resistor; and
a transistor having a gate, a source, and a drain, the gate coupled to the output of the amplifier, the source coupled to the second input of the amplifier and the second resistor, and the drain coupled to a reference voltage terminal;
wherein resistance of the second resistor is variable based on a first signal from the output of the amplifier and a second signal from the reference voltage terminal.